Astronomers can tell whether a light source approaches or recedes from Earth by
A) its temperature.
B) its change in temperature.
C) its absorption spectra.
D) the Doppler effect.
E) all of the above
Answer: D
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Magnetic Poles: A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will
A. contain only a north pole. B. contain a north pole on the right and a south pole on the left. C. contain only a south pole. D. no longer contain any poles.
A projectile is projected from the origin with a velocity of 15.0 m/s at an angle of 30.0 degrees above the horizontal. What is the velocity of the projectile 2.00 seconds later?
A. 17.8 m/s at an angle of 38 degrees above the horizontal B. 11.4 m/s at an angle of 43 degrees below the horizontal C. 17.8 m/s at an angle of 43 degrees below the horizontal D. 11.4 m/s at an angle of 38 degrees below the horizontal E. 17.8 m/s at an angle of 43 degrees above the horizontal
This x-ray image shows a loop of hot gas above the surface of the Sun. If we took a visible light photo that looked in the Sun's photosphere just under the two points where the loop of gas comes down (arrows), what would we find?
A) sunspots B) bright prominences C) coronal holes D) radiation zones
If the headlights on a car are separated by 1.3 m, how far down the road can they be resolved if the angular resolution of the eye is 5.0 × 10-4 rad and the person has excellent vision?
A) 1.3 km B) 5.0 km C) 4.8 km D) 0.65 km E) 2.6 km